// Given a Book ISBN (entered by the user) and a book record (read from currentBookFile)
// checks to see if the user ISBN matches the record ISBN (the first field of the record).
// If there is a match, this method splits the record into its 6 component parts and saves them.
// Every Record that does not match the ISBN entered by the user will be written to updatedBookFile
public Boolean findAndSaveBook(string ISBN)
{
string nextRecord;
Boolean isEndOfFile = true;
Boolean success;
Boolean found = false;
nextRecord = BookStoreClass.currentBookFile.getNextRecord(ref isEndOfFile); // Get the first record
while (!isEndOfFile)
{
BookClass newBook = new BookClass(); // Object declared and referenced
success = newBook.createBookObject(nextRecord); // Create a new book object with the attributes assigned
if (success == true) // Book object not successfully created
{
if (newBook.bookMatch(ISBN) == true) // Comparing Book hiddenISBN to user's inputted ISBN
{
this.Book = newBook; // Book assigned to this BookStoreClass object
MessageBox.Show("Book Found!\n" + Book.createStringToDisplay()); // Display the book
found = true; // (Book found)
}
else // Book doesn't match ISBN
{
updatedBookFile.writeNextRecord(newBook.getBookDataString()); // Write out book that didn't match ISBN to updatedBookFile
}
nextRecord = BookStoreClass.currentBookFile.getNextRecord(ref isEndOfFile); // Get the next record to analyze
}
}
return(found);
}
string bookDataString; // String containing the 6 attributes in this class used for display
// Creates an object using attributes obtained from currentBookFile Object
// ISBN TITLE AUTHOR PRICE NUMBERONHAND TRANSACTIONDATE
public Boolean createBookObject
(string s) // IN: string from the Book Text File
{
BookClass thisBook = this;
string[] bookString = s.Split('*'); // Seperate strings using asterisk seperator
bookString[0] = bookString[0].Trim(); // Trim starting and trailing whitespaces from ISBN
bookString[3] = bookString[3].Trim(); // Trim starting and trailing whitespaces from Price
bookString[4] = bookString[4].Trim(); // Trim starting and trailing whitespaces from NumberOnHand
int bookStringSize = bookString.GetLength(0);
// Check that ISBN is of required length
hiddenISBN = bookString[0];
if (bookString[0].Length != validISBNLength)
{
MessageBox.Show(bookString[0]
+ ": ISBN string is not exactly 7 characters. Book File Corrupt. Execution Terminated.",
"ISBN in Book File Invalid",
MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false); // ISBN not of required length retun false
}
// Check that Title is not blank
hiddenTitle = bookString[1];
if (hiddenTitle == " " || hiddenTitle == "")
{
MessageBox.Show(hiddenTitle
+ ": Title string is empty or Blank. Book File Corrupt. Execution Terminated.",
"Title in Book File Invalid",
MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false); // Title blank return false
}
// Check that Author is not blank
hiddenAuthor = bookString[2];
if (hiddenAuthor == " " || hiddenAuthor == "")
{
MessageBox.Show(hiddenAuthor
+ ": Author string is empty or Blank. Book File Corrupt. Execution Terminated.",
"Author in Book File Invalid",
MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false); // Author blank return false
}
// Check that string of price converted to decimal greater than zero
try
{
hiddenPrice = decimal.Parse(bookString[3].Replace(",", "").Replace("$", ""));
if (hiddenPrice < 0.00m)
{
MessageBox.Show(bookString[3]
+ ": Price cannot be less than zero. Book File Corrupt. Execution Terminated.",
"Price in Book File Invalid", MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false); // price less than zero return false
}
}
catch
{
MessageBox.Show(bookString[3]
+ ": Price string is empty or Blank. Book File Corrupt. Execution Terminated.",
"Price in Book File Invalid", MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false); // price invalid format return false
}
// Convert number on hand to integer number stored as hiddenNumberOnHand
try
{
hiddenNumberOnHand = Convert.ToInt32(bookString[4]);
}
catch
{
MessageBox.Show(bookString[4]
+ ": Number on hand string is not a valid integer. Book File Corrupt. Execution Terminated.",
"Number on hand in Book File Invalid",
MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false); // Not a valid integer return false
}
// Convert last Date of Access to a date stored as hiddenLastTransactionDate
try
{
hiddenLastTransactionDate = DateTime.Parse(bookString[5]);
}
catch
{
MessageBox.Show(bookString[5]
+ ": Date of Last Access string is not a valid date. Employee File Corrupt. Execution Terminated.",
"Date of last access in Employee File Invalid",
MessageBoxButtons.OK, MessageBoxIcon.Stop);
return(false); // invalid date format return false
}
// All data valid
return(true);
} // end createEmployeeObject